I have a section on a page with three cards. Should I use a single-column layout with a repeater field, or a three-column layout and a single field? Is there any benefits to one layout over the other?
If I use the single-column with a repeater field set to 30% is there any way to get them to line up horizontally in the layout during editing?
Both are valid ways to set something like that up. The 3-col layout could be a bit more flexible (perhaps the 3rd column will be a full-sized image instead of a card, for example) while the repeater would ensure the correct markup and more control as developer over the content.
Set the fields back to 100%, but on the repeater itself set “Manager Columns” (under properties) to 3: